TA DAAaaaaaa!!!!!  It's IN.    
  We already had to buy a new 'elbow'.  I messed around so much with it, that I broke the airtight seal.
I took the pipe right out of the chimney, and attached it to the elbow, then shoved the whole thing, 'pre-assembled' stove and all, into the wall.  The pipe that was supposed to fit OVER the other pipe actually ended up fitting the other way around.  Small wonder I couldn't make it fit.